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7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Portland, OR
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September
Average Temperature
High
23°
Feels 23
Low
12°
Feels 12
Average Precipitation
8 Days
Rain amount
37.9mm
Snow amount
0cm
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Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
18°
3
16°
4
20°
5
21°
6
23°
7
22°
8
23°
9
26°
10
26°
11
23°
12
22°
13
22°
14
23°
15
23°
16
23°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Wednesday, September 2, 2026
Day
18°
Feels 18
Wind
23 km/h S
Gust
39 km/h
Humidity
65%
P.O.P
90%
Rain
10-15 mm
Night
12°
Feels 10
Wind
18 km/h S
Gust
27 km/h
Humidity
94%
P.O.P
60%
Rain
~1 mm
Historical Averages
Sep 2
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.